Giant nonlinear refraction has been experimentally observed in gold island films. The complex third-order nonlinear
susceptibility χ(3)(ω;ω,-ω,ω) reaches a value of -8×10-5 esu (λ = 532 nm, ι = 10 ns) and (+5×10-7 + i0.3×10-7) esu (λ = 800 nm, ι = 85 fs). The mechanism of nonlinearity of the refractive index can be associated with the resonance enhancement of the factor of the local optical field at the pump wavelength due to the excitation of surface plasmons, as
well as with the contribution of the heating of conduction electrons in an ensemble of metal particles.
Nonlinear refraction has been for the first time studied in silicon carbide nanocrystal films synthesized by new technique
of direct carbide and silicon ion deposition with ion energy of 100eV and low substrate temperature from 900°C to
1150°C. The films were shown to exhibit large optical nonlinear cubic susceptibility χ(3) ≅ 10-6 esu (λ=1064nm and λ=532nm, τи = 10ns).
Giant nonlinear refraction has been experimentally observed in gold island films. The real part of the third-order
nonlinear susceptibility χ(3)(ω;ω,-ω,ω) reaches a value of -8×10-5 esu (λ = 532 nm, τ = 10 ns) and +5×10-7 esu (λ = 800
nm, τ = 85 fs). The mechanism of nonlinearity of the refractive index can be associated with the resonance enhancement
of the factor of the local optical field at the pump wavelength due to the excitation of surface plasmons, as well as with
the contribution of the heating of conduction electrons in an ensemble of metal particles.
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